"Our detection of such weak wobbles is a milestone in the search for Earth analogues and the understanding of the Earth's habitability through comparison with these."

Stars the size of the Sun are the best targets for finding habitable Earth-seized planets.

Tau Ceti is similar to our Sun in size and brightness, and like our Sun hosts a multi-planet system.

Scientists hope that direct imaging of the two outer planets could show them to be rocky and habitable.

University of Hertfordshire

SOLAR SYSTEM: The discovery was made by observing wobbles in the movement of the star

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But, they did warn that a massive disc of debris around the star could be bombarding them with asteroids and comets, reducing their habitability.

Co-author Dr Mikko Tuomi, also from the University of Hertfordshire, said improved techniques were making it easier to distinguish between light signals caused by the presence of planets and stellar activity.

Two Tau Ceti signals previously identified in 2013 are now known not to have a planetary origin.

"But no matter how we look at the star, there seems to be at least four rocky planets orbiting it," Dr Tuomi said.